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Developer-C 11.1
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WITH a AS ( SELECT 1 AS id, 'john' AS name UNION ALL SELECT 2, 'doe' UNION ALL SELECT 3, 'smith' ), b AS ( SELECT 1 AS a_id, 4 AS amount, 1 AS shop UNION ALL SELECT 1, 3, 2 UNION ALL SELECT 2, 2, 2 UNION ALL SELECT 2, 7, 3 UNION ALL SELECT 3, 3, 3 UNION ALL SELECT 3, 1, 2 ) SELECT a.name, CASE WHEN MAX(CASE WHEN b.shop = 1 THEN 1 ELSE 0 END) > 0 THEN SUM(CASE WHEN b.shop = 1 THEN b.amount ELSE 0 END) ELSE SUM(b.amount) END AS amount, MAX(CASE WHEN b.shop = 1 THEN 1 ELSE 0 END) AS shop FROM a LEFT JOIN b ON a.id = b.a_id GROUP BY a.name;
name
amount
shop
john
4
1
doe
9
0
smith
4
0